Stay Cable

Abstract

The present invention discloses a stay cable, comprising a stay cable body, an anchoring device, a protective tube, a first protective cover, a second protective cover, and a dehumidification system. Anchoring devices are provided at both ends of the stay cable body. Anchor pads are provided on the outer surface of the anchoring devices, separating the anchoring devices into a front end and a rear end. The protective tube body is sealed to the two anchor pads at each end, with the front end of the anchoring device located within the protective tube body. The first protective cover is connected to the rear end of the anchoring device, and the second protective cover is sealed to the anchor pads. The first protective cover is housed within the second protective cover. The second protective cover defines an air cavity and a vent communicating with the air cavity. The air cavity communicates with the interior of the protective tube body. The dehumidification system is configured to provide dry gas to one of the air cavities. The stay cable can completely protect the anchoring devices from corrosion, while also achieving dehumidification and corrosion protection for the entire stay cable, thereby extending its service life and reducing maintenance costs.

Description

Technical Field

[0001] The present invention relates to the technical field of stay cables, and in particular to a stay cable. Background Art

[0002] A cable-stayed bridge, also known as a cable-tensioned bridge, is a bridge in which the main beam is directly connected to the towers by numerous cables. The bridge structure consists of a compression-bearing tower, tension-bearing cables, and a bending-bearing beam. It can be considered a multi-span elastically supported continuous beam with cables replacing buttresses. This reduces bending moments within the beam, lowers building height, reduces structural weight, and saves material. Therefore, the cables are a crucial component of a cable-stayed bridge, and their quality directly impacts the overall quality of the bridge.

[0003] In practice, since cable-stayed cables are extremely susceptible to corrosion, regular maintenance such as oiling and cable replacement is required, resulting in high maintenance costs and long repair times. The cost of repairing some cable-stayed bridges is higher than the construction cost, and the cable-stayed bridges have a short lifespan, posing safety hazards.

[0004] To this end, the same applicant previously applied for a steel strand stay cable with application number CN201810653704.7. In the steel strand stay cable, the steel strand stay cable includes a stay cable body, anchoring devices at both ends of the stay cable body, and a protective tube body, wherein the two ends of the stay cable body are respectively penetrated by the anchoring devices at both ends thereof, the protective tube body is sleeved on the stay cable body and its two ends are connected to the anchoring devices at both ends of the stay cable body. In practice, rainwater easily enters the interior of the steel strand stay cable from the connection position thereof. In order to dehumidify the stay cable body, the steel strand stay cable also Protective covers and ventilation pipes are added to both ends of the inclined cable body, wherein an air cavity is enclosed between the protective cover and the end of the anchoring device away from the protective tube body, and a ventilation hole is opened on the protective cover, and the ventilation pipe connects the air cavity and the interior of the protective tube body, so that gas can enter the air cavity from the ventilation hole, and then enter the protective tube body through the ventilation pipe, taking away the moisture on the inclined cable body, and flowing into the air cavity at the other end from the ventilation pipe at the other end, and then discharged from the ventilation hole at the other end, thereby dehumidifying the inclined cable body, thereby avoiding corrosion of the inclined cable, reducing maintenance costs, and also increasing the service life of the inclined cable.

[0005] However, the above-mentioned steel strand stay cables still have the following problems:

[0006] Since the anchoring devices, anchor pads and bolts used for connection at both ends of the inclined cable are made of metal materials, they are easily corroded if they are in a humid environment for a long time. In the above-mentioned steel strand inclined cable, since the anchoring device is exposed to the inclined cable body, the anchoring device still has the problem of easy corrosion. The anchoring device is a key component for achieving a fixed connection between the inclined cable body and the bridge deck and the tower. If the anchoring device is easy to corrode, it is easy to cause the problem of unstable connection between the inclined cable body and the bridge deck and the tower. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a cable-stayed cable that can completely protect the connecting bolts of the anchoring device and the first protective cover, so that the connecting bolts of the anchoring device and the first protective cover are protected from corrosion. At the same time, it can also realize the dehumidification and anti-corrosion function of the entire cable-stayed cable, thereby increasing its service life and reducing maintenance costs.

[0008] The purpose of the present invention is achieved by adopting the following technical solutions:

[0009] A stay cable, wherein the first end of the stay cable is used to be connected to the bridge, and the second end of the stay cable is used to be connected to the tower, comprising a stay cable body, an anchoring device, a protective pipe body, a first protective cover, a second protective cover and a dehumidification system, the stay cable body is composed of a plurality of steel strands, two anchoring devices are provided, the two anchoring devices are respectively fixed to the two ends of the stay cable body, the outer wall of the anchoring device is provided with an anchor pad, which separates the anchoring device into a front end and a rear end, the protective pipe body is sleeved outside the stay cable body, the two ends of the protective pipe body are respectively connected to the anchor pads on the two anchoring devices, and the front end of the anchoring device is accommodated to the In the protective tube body, the first protective cover is connected to the rear end of the anchoring device, the second protective cover is sealed to the anchor plate, and the first protective cover is accommodated in the second protective cover. The second protective cover is provided with an air cavity and an air vent connected to the air cavity. The air cavity is connected to the interior of the protective tube body. The dehumidification system is used to provide dry gas to the air cavity. The dehumidification system is arranged near the first end or the second end of the inclined cable, and the outlet of the dehumidification system is connected to the air vent. During ventilation, the dry gas enters the air cavity from the air vent, flows to the interior of the protective tube body and the other air cavity in sequence, and is then discharged from the other air vent.

[0010] Furthermore, a gas passage connecting the air cavity and the interior of the protective tube body is provided on the anchoring device or the anchor pad.

[0011] Furthermore, the dehumidification system includes a dehumidification module and a cable-stayed ventilation module connected to the dehumidification module for delivering fresh air processed by the dehumidification module to the cable-stayed cable, wherein the cable-stayed ventilation module connects the dehumidification module and the vent; wherein the dehumidification module includes:

[0012] A filtering device for filtering the input fresh air;

[0013] a dehumidification device, used for dehumidifying the fresh air filtered by the filtering device, the dehumidification device being connected to the filtering device;

[0014] a dry air balancing device, used for balancing the air pressure of the fresh air dehumidified by the dehumidification device, the dry air balancing device being connected to the dehumidification device;

[0015] The gas conveying device is used to convey the fresh air to the filtering device, the dehumidifying device and the dry air balancing device in sequence, and the gas conveying device is connected to the filtering device, the dehumidifying device and the dry air balancing device respectively.

[0016] Furthermore, the protective tube body includes a first protective sleeve and a second protective sleeve, the first protective sleeve is arranged near the first end of the inclined cable, and the second protective sleeve is arranged near the second end of the inclined cable, the first protective sleeve is inserted into the interior of the second protective sleeve, and a first seal is provided between the first protective sleeve and the second protective sleeve, the inner wall surface of the second protective sleeve is provided with a first annular groove, and the first seal is embedded in the first annular groove.

[0017] Furthermore, the protective tube body includes a first protective sleeve and a second protective sleeve, the first protective sleeve is arranged near the first end of the inclined cable, and the second protective sleeve is arranged near the second end of the inclined cable, the first protective sleeve is inserted into the interior of the second protective sleeve, and the connection position between the first protective sleeve and the second protective sleeve is wrapped with a laminated canvas or felt, one end of the laminated canvas or felt is sealed with the outer wall surface of the first protective sleeve, and the other end of the laminated canvas or felt is sealed with the outer wall surface of the second protective sleeve.

[0018] Furthermore, the protective tube body also includes a first cable guide tube, the first end of the first cable guide tube is sleeved on the outer wall surface of the anchoring device near the first end of the inclined cable and is fixedly connected to the anchor plate, the second end of the first cable guide tube is inserted into the interior of the first protective sleeve near one end of the first cable guide tube, and a second sealing member is provided between the first protective sleeve and the first cable guide tube, and a second annular groove is provided on the inner wall surface of the first protective sleeve near one end of the first cable guide tube, and the second sealing member is embedded in the second annular groove.

[0019] Furthermore, the protective tube body also includes a conical flow guide tube arranged between the first cable guide tube and the first protective sleeve, the conical flow guide tube includes a first connecting tube, a second connecting tube and a conical cylinder connecting the first connecting tube and the second connecting tube, the aperture of the first connecting tube is larger than the aperture of the second connecting tube, the first connecting tube is sleeved on the outer wall surface of the second end of the first cable guide tube, the second sealing member is arranged between the first connecting tube and the second end of the first cable guide tube, the second connecting tube is inserted into the interior of the first protective sleeve near one end of the first cable guide tube, and a third sealing member is provided between the second connecting tube and the first protective sleeve.

[0020] Furthermore, a limiting groove is provided on the inner wall surface of one end of the first protective sleeve connected to the second connecting pipe, and the second connecting pipe is inserted into the limiting groove and abuts against the bottom wall of the limiting groove.

[0021] Furthermore, the third sealing member is an elastic tube body, and the elastic tube body is sleeved at the connection position between the second connecting tube and the first protective sleeve.

[0022] Furthermore, the protective tube body also includes a second cable guide tube, the first end of the second cable guide tube is sleeved on the outer wall surface of the anchoring device near the second end of the inclined cable and is fixedly connected to the anchor plate, the second end of the second cable guide tube is sleeved on the outer wall surface of the second protective sleeve near the second end of the inclined cable, and a fourth seal is provided between the second end of the second cable guide tube and the second protective sleeve.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] By sleeved the protective tube body outside the inclined cable body, the two ends of the protective tube body are respectively connected to the anchor pads on the two anchoring devices, and the front end of the anchoring device is accommodated in the protective tube body, the first protective cover is connected to the rear end of the anchoring device, the second protective cover is sealed and connected to the anchor pad, and the first protective cover is accommodated in the second protective cover, so that the connecting bolts of the anchoring device and the first protective cover are also protected, and rainwater can be prevented from entering the interior of the inclined cable from the gap between the second protective cover and the anchor pad or from the gap between the protective tube body and the anchor pad to cause corrosion of the anchoring device, thereby improving the service life of the anchoring device, and by making the air cavity communicate with the interior of the protective tube body. The dehumidification system is used to introduce dry gas into the vent, and the dry gas flows into the air cavity, the interior of the protective tube body, and another air cavity in sequence, and then is discharged from another vent. The dry gas removes the moisture inside the inclined cable, so that the interior of the inclined cable remains dry, and the various components of the inclined cable are prevented from being corroded, thereby increasing the service life of the entire inclined cable. In addition, since a second protective cover is added at both ends of the inclined cable, the inclined cable forms a closed structure as a whole. Therefore, only one set of dehumidification systems needs to be added to ensure a dry environment inside the inclined cable, avoiding the need to add a dehumidification system at both ends of the inclined cable, thereby reducing the manufacturing cost and energy consumption of the cable-stayed bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of the inclined cable of the present invention;

[0026] Figure 2 for Figure 1 A partial enlarged view of point A in the inclined cable is shown;

[0027] Figure 3 for Figure 1 A partial enlarged view of point B in the inclined cable is shown;

[0028] Figure 4 for Figure 1 A partial enlarged view of point B in the inclined cable of another embodiment shown;

[0029] Figure 5 for Figure 1 A partial enlarged view of point B in the inclined cable of another embodiment shown;

[0030] Figure 6 for Figure 1 The enlarged view of the part C in the inclined cable is shown;

[0031] Figure 7 for Figure 1 The enlarged view of the part D in the inclined cable is shown;

[0032] Figure 8 for Figure 1A partial enlarged view of point E in the inclined cable is shown.

[0033] In the figure: 1. Stay cable body; 2. Anchoring device; 31. First protective cover; 32. Second protective cover; 33. First cable guide tube; 34. Conical guide tube; 341. First connecting tube; 342. Second connecting tube; 343. Conical cylinder; 35. Second cable guide tube; 4. Anchor plate; 41. Gas channel; 5. First protective cover; 6. Second protective cover; 61. Air cavity; 62. Vent; 7. First seal; 8. Laminating canvas; 9. First clamp; 10. Retractable sealing sleeve; 20. Second clamp; 30. Second seal; 40. Third seal; 50. Flange; 60. Fourth seal. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0035] See also Figure 1 , shows a preferred embodiment of a stay cable of the present invention, the first end of the stay cable is used to connect to the bridge, and the second end of the stay cable is used to connect to the tower, such as Figure 1 It can be seen that the first end of the inclined cable is the left end in the figure, and the second end is the right end in the figure. The inclined cable includes an inclined cable body 1 (generally composed of multiple strands of steel wire, which is a very important load-bearing member of the bridge), an anchoring device 2, a protective pipe body, a first protective cover 5, a second protective cover 6 and a dehumidification system. There are two anchoring devices 2, and the two anchoring devices 2 are respectively fixed to the two ends of the inclined cable body 1. In practice, the two ends of the inclined cable body 1 can be fixed to the bridge and the tower with the help of the anchoring devices 2, such as Figure 2As shown, the outer wall of the anchor device 2 is provided with an anchor pad 4, which separates the anchor device 2 into a front end and a rear end, and the protective tube body is sleeved outside the inclined cable body 1, and the two ends of the protective tube body are respectively connected to the anchor pads 4 on the two anchor devices 2, and the front end of the anchor device 2 (that is, the end of the anchor device 2 close to the protective tube body) is accommodated in the protective tube body, and the first protective cover 5 is sealed and fixedly connected to the rear end of the anchor device 2 (that is, the end of the anchor device 2 away from the protective tube body). The first protective cover 5 can protect the metal parts such as the part of the inclined cable body 1 exposed to the anchor device 2 and the rear end of the anchor device 2 from being eroded by moisture or rainwater, and the second protective cover 6 is sealed and fixedly connected to the anchor pad 4, and the first protective cover 5 is accommodated in the second protective cover 6 to protect the anchor device 2. The connecting bolts of the anchoring device 2 and the first protective cover 5 are protected, so that the connecting bolts of the anchoring device 2 and the first protective cover 5 are protected from rain erosion. The second protective cover 6 is provided with an air cavity 61 and an air vent 62 connected to the air cavity 61 for gas to pass in or out. The air cavity 61 is connected to the interior of the protective pipe body. A dehumidification system (not shown in the figure) is used to provide dry gas to one of the air cavities 61. The dehumidification system is arranged near the first end or the second end of the inclined cable, and the outlet of the dehumidification system is connected to the air vent 62 of one of the second protective covers 6 for dry gas to enter the air cavity 61. During ventilation, the dry gas enters the air cavity 61 from the dehumidification vent 62, flows through the interior of the protective pipe body, the other air cavity 61, and is then discharged from the other air vent 62.

[0036] The inclined cable of the present invention is achieved by sheathing a protective tube body outside the inclined cable body 1, the two ends of the protective tube body are respectively connected to the anchor plates 4 on the two anchoring devices 2, and the front end of the anchoring device 2 is accommodated in the protective tube body, the first protective cover 5 is connected to the rear end of the anchoring device 2, the second protective cover 6 is sealed and connected to the anchor plate 4, and the first protective cover 5 is accommodated in the second protective cover 6, so that the connecting bolts of the anchoring device 2 and the first protective cover 5 are also protected, and rainwater can be prevented from entering the interior of the inclined cable from the gap between the second protective cover 6 and the anchor plate 4 or from the gap between the protective tube body and the anchor plate 4 to cause corrosion of the anchoring device 2, thereby improving the service life of the anchoring device 2, and by making the air cavity 61 and The interior of the protective tube body is connected, and dry gas is introduced into the air vent 62 by means of a dehumidification system. The dry gas flows in sequence to the air cavity 61, the interior of the protective tube body, and another air cavity 61, and is then discharged from another air vent 62. The dry gas brings out the moisture inside the inclined cable, so that the interior of the inclined cable remains dry, and the various components of the inclined cable are prevented from being corroded, thereby increasing the service life of the entire inclined cable. In addition, since a second protective cover 6 is added at both ends of the inclined cable, the inclined cable forms a closed structure as a whole. Therefore, only one set of dehumidification systems needs to be added to ensure a dry environment inside the inclined cable, avoiding the need to add a dehumidification system at both ends of the inclined cable, thereby reducing the manufacturing cost and energy consumption of the inclined cable-stayed bridge.

[0037] like Figure 2 As shown, in order to connect the air cavity 61 and the protective tube body, a gas channel 41 can be opened on the anchor plate 4, and the gas channel 41 is a ventilation groove or a ventilation hole 62. The gas channel 41 connects the air cavity 61 and the interior of the protective tube body. By opening the gas channel 41 on the anchor plate 4, the air cavity 61 and the interior of the protective tube body can be connected through the gas channel 41. Compared with the prior art, the operation of pre-embedding the ventilation pipe connecting the air cavity 61 and the interior of the protective tube body on the anchor device 2 is eliminated, which simplifies the installation process of the inclined cable and simplifies the overall structure of the inclined cable.

[0038] Of course, it is also possible to directly open a gas channel 41 connecting the air cavity 61 and the interior of the protective tube body on the anchoring device 24. Specifically, due to the differences in the specific structures of the anchoring devices 2 at both ends of the inclined cable, the gas channel 41 at the first end of the inclined cable (called the beam end gas channel 41) can be specifically provided on the washer. The washer is sleeved on the outer wall surface of the anchoring device 2 near the first end of the inclined cable. The washer is arranged adjacent to the anchor plate 4 at the first end of the inclined cable, and the washer is accommodated in the second protective cover 6. One end of the gas channel 41 opened on the washer is connected to the air cavity 61, and the other end is connected to the second protective cover 6. Through the gap between the anchor plate 4 and the anchor device 2 next to the washer, and then connected to the interior of the protective tube body through the gap, the gas channel 41 located at the second end of the inclined cable is provided on the (tower end gas channel 41) on the nut mounted on the outer wall of the anchor device 2 near the second end of the inclined cable, and the nut is located between the anchor plate 4 near the second end of the inclined cable and the second protective cover 6 located at the second end of the inclined cable. One end of the gas channel 41 opened on the nut is connected to the air cavity 61, and the other end is connected to the gap between the anchor plate 4 and the anchor device 2, and then connected to the interior of the protective tube body through the gap.

[0039] In this embodiment, the dehumidification system is located near the lower end of the cable. Since the humidity RH1 of the dry air entering the cable through the vent 62 at the lower end is much lower than the humidity RH2 of the air inside the cable, the dry air mixes with the moist air inside the cable as it flows through the cable, reaching a new humidity RH3 (RH1 < RH3 < RH2). Finally, the air with humidity RH3 is discharged from the vent 62 at the upper end of the cable. This reduces the humidity of the air inside the cable from RH2 to RH3. In other words, by continuously introducing dry air into the cable, the humidity inside the cable can be continuously reduced until it equals the humidity of the introduced dry air, thereby achieving the purpose of corrosion protection for the cable. Simply installing a temperature and humidity sensor on the vent 62 at the upper end of the cable allows the ambient humidity inside the cable to be monitored at all times, thereby maintaining the interior of the cable dry.

[0040] In this embodiment, the dehumidification system is arranged near the first end of the inclined cable, so that the dry gas is connected to the interior of the inclined cable in a bottom-up manner. The dry gas circulates inside the inclined cable under the action of pressure, which can dilute the water vapor inside the inclined cable to a certain extent, thereby reducing the degree of corrosion of the inclined cable, thereby increasing the service life of the inclined cable and the cable-stayed bridge.

[0041] Preferably, the dehumidification system (not shown in the figure) includes a dehumidification module, and a cable-stayed ventilation module connected to the dehumidification module for conveying fresh air processed by the dehumidification module to the cable-stayed cable, and the cable-stayed ventilation module connects the dehumidification module and the vent 62; wherein the dehumidification module includes: a filtering device, which is used to filter the input fresh air; a dehumidification device, which is used to dehumidify the fresh air filtered by the filtering device, and the dehumidification device is connected to the filtering device; a dry air balancing device, which is used to balance the air pressure of the fresh air dehumidified by the dehumidification device, and the dry air balancing device is connected to the dehumidification device; a gas conveying device, which is used to convey the fresh air to the filtering device, the dehumidification device and the dry air balancing device in sequence, and the gas conveying device is respectively connected to the filtering device, the dehumidification device and the dry air balancing device. The purpose of dehumidification and corrosion prevention is achieved by supplying dry air to the stay cables through the dehumidification system. The air supply volume of the dehumidification system is reasonably designed and the system can be detected in time, which solves the rust problem of the upper and lower anchor devices 2 and the stay cable body 1. The frequency of replacing the stay cables is greatly reduced, the maintenance cost is reduced, the safety of the bridge is effectively improved, and the adverse consequences of maintenance measures such as oiling and cable replacement that require long-term bridge closure are avoided.

[0042] It can be understood that other specific structures of the above-mentioned dehumidification system can be referred to a cable-stayed dehumidification system and a cable-stayed dehumidification method previously applied for by the same applicant, with application number CN201710241025.4.

[0043] Since the dry gas has to pass through the energy loss and long resistance along the gas channel 41 twice from the vent hole 62 at the lower end of the inclined cable to the vent hole 62 at the upper end of the inclined cable, in order to ensure that the dry gas can be effectively transported, it is necessary to seal the connection positions of the inclined cable. Figure 3-Figure 8 .

[0044] See also Figure 1 The protective tube body includes a first protective sleeve 31 and a second protective tube. The first protective sleeve 31 is arranged near the first end of the inclined cable, and the second protective sleeve 32 is arranged near the second end of the inclined cable. The first protective sleeve 31 is inserted into the interior of the second protective sleeve 32. The length of the first protective sleeve 31 is longer than that of the second protective sleeve 32, and the outer diameter of the first protective sleeve 31 is smaller than that of the second protective sleeve 32. In practice, the inclined cable is arranged according to Figure 1 The arrangement shown is installed so that the Figure 1 The second protective cover 32 at the upper right end of the middle portion is wrapped around Figure 1 At the same time as the opening of the first protective cover 31 at the lower left end of the Figure 1 The opening of the second protective cover 32 at the upper right end faces downward, thereby increasing the difficulty of rainwater entering the protective tube body.

[0045] In practice, because the protective sleeve is typically made of PE tubing, which is sensitive to temperature fluctuations, the overall length of the protective tubing varies significantly between winter and summer. To provide rain protection, the first and second protective sleeves 31, 32 are constructed as two sections of retractable, compensating tubing, ensuring that the first sleeve 31 does not separate from the second sleeve 32 during seasonal changes. Therefore, dynamic sealing is necessary when considering the connection between the first and second protective sleeves 31, 32. Three solutions for sealing this location have been proposed.

[0046] Option 1:

[0047] See also Figure 3 A first seal 7 is provided between the first and second protective sleeves 31, 32. The inner wall of the second protective sleeve 32 defines a first annular groove, into which the first seal 7 is embedded. This secures the first seal 7 and prevents it from becoming disconnected from the first and second protective sleeves 31, 32 during relative movement due to thermal expansion and contraction. This arrangement not only provides expansion and contraction compensation for the two protective sleeves, but also ensures a reliable seal between the two sleeves, preventing seal failure and enhancing waterproofing between the two sleeves. The first seal 7 is preferably a Y-shaped sealing ring. When a temperature difference occurs, the two protective sleeves are made of the same material, resulting in comparable radial deformation. Furthermore, the Y-shaped sealing ring itself is elastic, allowing it to maintain a radial seal even when deformed by temperature. In the axial direction, the protective sleeves experience only minimal resistance from the Y-shaped sealing ring, allowing them to expand and contract freely. As long as the length of the protective sleeves is sufficient to maintain the sealing range of the Y-shaped sealing ring despite seasonal temperature fluctuations, a long-term, effective seal can be achieved at this location.

[0048] Option 2:

[0049] Of course, the sealing connection between the first protective sleeve 31 and the second protective sleeve 32 can also be achieved by Figure 4 The method shown, see Figure 4 The connection between the two protective sleeves (the first protective sleeve 31 and the second protective sleeve 32) is wrapped with a laminated canvas 8 or felt. One end of the laminated canvas 8 or felt is sealed to the outer wall of one of the protective sleeves using a sealant, and the other end of the laminated canvas 8 or felt is sealed to the outer wall of the other protective sleeve using a sealant. Since this sealing method can be wrapped around the connection between the two protective sleeves in a circle after the two protective sleeves are installed, this sealing method is very suitable for later maintenance work.

[0050] It is understandable that the laminated canvas 8 or felt has better aging resistance, UV resistance and corrosion resistance, and has air-tight and moisture-proof properties.

[0051] In order to make the connection between the laminated canvas 8 or felt and the protective sleeve more reliable, the two ends of the laminated canvas 8 or felt are respectively fixed to the two protective sleeves through a first clamp 9.

[0052] The implementation method of this scheme is as follows: First, prepare a piece of laminated canvas 8 or felt of appropriate length and width according to the actual situation of the inclined cable to be installed. The appropriate length means that the laminated canvas 8 or felt can meet the requirements of the connection position between the two protective sleeves in the axial direction, leaving the installation position of the first clamp 9 and a margin. It is recommended to take 0.8-1m. The appropriate width means that the total length of the laminated canvas 8 or felt in the width direction should be at least twice the circumference of the protective sleeve at the upper end. First, wrap the protective sleeve at the upper end and the protective sleeve at the lower end with the laminated canvas 8 or felt. Then, apply a strip of silicone sealant from one section to the other on the overlapping surface of the laminated canvas 8 or felt and the laminated canvas 8 or felt along the axis of the protective tube body. Press gently along the direction of the sealant strip to ensure that the laminated canvas 8 or felt surface is completely bonded to the laminated canvas 8 or felt surface, and then continue to wrap along the circumference. Every time it turns about 45°, apply a strip of silicone sealant according to the previous method and press to bond it, then continue wrapping. The rubberized canvas 8 or felt must cover at least 2 circumferences to meet the requirements. After wrapping is completed, use the first clamp 9 to clamp one end of the rubberized canvas 8 or felt and one of the protective sleeves together. In order to ensure the seal at this position, a sealing tape can be wrapped around the circumference of the protective sleeve below the first clamp 9. Use the first clamp 9 to clamp the other end of the rubberized canvas 8 or felt on the other protective sleeve. From the previous analysis, it is known that the protective tube body will produce relative displacement with the rubberized canvas 8 or felt due to the temperature difference, and when the protective tube body is very long or the temperature difference is large, the relative displacement is large. Therefore, the protective tube body and the rubberized canvas 8 or felt cannot be clamped tightly. Here, a layer of elastic sealing strip can be used to wrap the circumference of the protective tube body below the first clamp 9, and then a certain pre-tightening force can be applied to the first clamp 9. In this way, elastic compensation generated in the radial direction of the protective tube ensures radial sealing. In the axial direction, the protective tube is only subject to slight friction from the sealing strip, which does not affect axial deformation. Furthermore, since the pressure generated inside the cable during dehumidification operation is not high, the sealing requirements at this location are not very high, and slight leakage is acceptable. Therefore, this solution can also achieve effective sealing.

[0053] Option 3:

[0054] In addition, the sealing connection between the two protective sleeves can also be achieved by Figure 5The method shown (for details, please refer to the steel stranded cable previously applied for by the same applicant), see Figure 5 A retractable sealing sleeve 10 is sleeved between the two protective sleeves. One end of the retractable sealing sleeve 10 is sleeved outside one of the protective sleeves and sealed with the outer surface of the protective sleeve, and the other end is sleeved outside the other protective sleeve and sealed with the outer surface of the protective sleeve. The retractable sealing sleeve 10 can freely retract and contract within a certain length range. Therefore, as long as the selected retractable range is appropriate, the length change of the protective tube body caused by temperature difference can also be compensated.

[0055] and Figure 4 Similar to the method shown, to improve the sealing performance between the telescopic sealing sleeve 10 and the protective sleeve, a sealant is provided between the telescopic sealing sleeve 10 and the protective sleeve. To ensure a more reliable connection between the telescopic sealing sleeve 10 and the protective sleeve, the two ends of the telescopic sealing sleeve 10 are fixed to the two protective sleeves via a second clamp 20.

[0056] In practice, since the material of the protective tube body is a material with good tensile properties, it is difficult to achieve a sealed connection between the protective tube body and the anchoring device 2, which in turn causes water to easily enter between the protective tube body and the anchoring device 2. In order to improve the waterproof performance, Figure 1 as well as Figure 6 As shown, the protective pipe body also includes a first cable guide tube 33 (also called a beam end cable guide tube). The first end of the first cable guide tube 33 is sleeved on the outer wall surface of the anchor device 2 near the first end of the inclined cable and is fixed to the anchor plate 4. In order to achieve a reliable connection between the first cable guide tube 33 and the anchor device 2, the connection between the first cable guide tube 33 and the anchor plate 4 can be reinforced by welding (preferably full welding connection) or bolt connection, as shown in FIG. Figure 6 As shown, the second end of the first cable guide tube 33 is inserted into the interior of the first protective cover 31, so that the opening of the second end of the first cable guide tube 33 is wrapped by the first protective cover 31, and the opening of the first protective cover 31 is downward, which increases the difficulty of rainwater entering the interior of the first protective cover 31. Figure 6 A second sealing member 30 is provided between the first protective sleeve 31 and the first cable guide tube 33, and a second annular groove is provided on the inner wall surface of the first protective sleeve 31 at one end close to the first cable guide tube 33. The second sealing member 30 is embedded in the second annular groove, which plays a role in fixing the second sealing member 30. This can prevent the second sealing member 30 from being disconnected from the first cable guide tube 33 and the first protective sleeve 31 when the first protective sleeve 31 moves relative to the first cable guide tube 33 due to thermal expansion and contraction, thereby avoiding sealing failure and improving the waterproof effect.

[0057] like Figure 1 、 Figure 6 as well as Figure 7As shown, the protective tube body also includes a tapered flow guide tube 34 provided between the first cable guide tube 33 and the first protective sleeve 31. The tapered flow guide tube 34 includes a first connecting tube 341, a second connecting tube 342, and a tapered cylinder 343 connecting the first connecting tube 341 and the second connecting tube 342. Figure 6 As shown, the aperture of the first connecting tube 341 is larger than that of the second connecting tube 342. The first connecting tube 341 is sleeved on the outer wall surface of the second end of the first cable guide tube 33 to wrap the opening of the first cable guide tube 33 and make the opening of the lower end of the tapered flow guide tube 34 face downward, increasing the difficulty of rainwater entering the interior of the inclined cable. The second sealing member 30 is provided between the first connecting tube 341 and the second end of the first cable guide tube 33. Figure 7 As shown, the second connecting tube 342 is inserted into the interior of the first protective cover 31 at one end near the first cable guide tube 33 to wrap the opening of the upper end of the tapered guide tube 34 and make the lower end opening of the first protective cover 31 face downward, thereby increasing the difficulty of rainwater entering the interior of the inclined cable, and a third sealing member 40 is provided between the second connecting tube 342 and the first protective cover 31 to achieve a sealed connection and improve the waterproof effect. In practice, since the first end of the inclined cable close to the bridge is extremely easy to enter with water, a conical guide tube 34 is arranged between the first cable guide tube 33 and the first protective cover 31. The second connecting tube 342 of the conical guide tube 34 faces upward, and the first connecting tube 341 faces downward, and the second connecting tube 342 and the first connecting tube 341 are connected by a conical tube 343. In this way, the conical guide tube 34 is covered on the first cable guide tube 33 like a trumpet. The outer wall surface of the conical tube 343 can guide rainwater to an area away from the connection position between the first cable guide tube 33 and the first protective cover 31, thereby reducing the amount of water at the connection position between the first cable guide tube 33 and the first protective cover 31, and avoiding rainwater from easily entering the interior of the inclined cable from the connection position between the first cable guide tube 33 and the first protective cover 31 due to excessive water volume, thereby improving the waterproof effect.

[0058] Continue to see Figure 7 A limiting groove is provided on the inner wall surface of one end where the first protective sleeve 31 is connected to the second connecting pipe 342. The second connecting pipe 342 is inserted into the limiting groove and abuts against the bottom wall of the limiting groove, thereby limiting the first protective sleeve 31 and preventing the first protective sleeve 31 from being excessively stretched toward the first end of the inclined cable due to thermal expansion and contraction, thereby causing the two protective sleeves to become disconnected.

[0059] Preferably, the third sealing member 40 is an elastic tube, which is sleeved at the connection between the second connecting tube 342 and the first protective sleeve 31 to provide expansion and contraction compensation for the first protective sleeve 31. Specifically, in this embodiment, the elastic tube is a heat shrink tube or a double-wall heat shrink tube with hot melt adhesive on the inner wall, thereby ensuring a more reliable sealing connection between the second connecting tube 342 and the first protective sleeve 31. Of course, the elastic tube can also be an elastic, retractable sleeve.

[0060] Similarly, if Figure 1 as well as Figure 8 As shown, the protective tube body also includes a second cable guide tube 35 (also called a tower end cable guide tube). The first end of the second cable guide tube 35 is sleeved on the outer wall surface of the anchor device 2 near the second end of the inclined cable and is fixedly connected to the anchor plate 4. In order to achieve a reliable connection between the second cable guide tube 35 and the anchor plate 4, the connection between the second cable guide tube 35 and the anchor plate 4 can be reinforced by welding (preferably full welding connection) or bolt connection. The second end of the second cable guide tube 35 is sleeved on the outer wall surface of the second protective cover 32 near the second end of the inclined cable to wrap the upper end opening of the second protective cover 32 and make the lower end opening of the second cable guide tube 35 face downward, increasing the difficulty of rainwater entering the interior of the inclined cable, and a fourth sealing member 60 is provided between the second end of the second cable guide tube 35 and the second protective cover 32 to achieve a sealed connection between the second cable guide tube 35 and the second protective cover 32, thereby achieving a better waterproof effect.

[0061] Continue to see Figure 8 To ensure a secure connection between the second cable guide tube 35 and the second protective cover 32, a flange 50 is hermetically connected to the inner wall surface of the second end of the second cable guide tube 35. The flange 50 is connected to the second protective cover 32, and a fourth sealing member 60 is provided at the connection between the flange 50 and the second protective cover 32. This ensures a secure connection between the upper end of the second protective cover 32 and the second cable guide tube 35. Specifically, the secure seal between the flange 50 and the second end of the second cable guide tube 35 can be achieved by full welding or spot welding with a sealant sealant.

[0062] Specifically in this embodiment, by plugging the lower end of the first protective cover 31 into the first cable guide tube 33, the upper end of the second protective cover 32 is reliably fixed to the second cable guide tube 35, thereby avoiding excessive pulling on the second end of the inclined cable due to the telescopic movement of the first protective cover 31 or the second protective cover 32, thereby preventing the structure of the inclined cable from being unstable, thereby improving the service life.

[0063] It is understood that the second sealing member 30 and the fourth sealing member 60 can both be sealing rings or sealants. The first and second cable guide tubes 33 and 35 can be made of steel, the tapered flow guide tube 34 can be made of steel or PE, and the protective sleeves (including the first and second protective sleeves 31 and 32) can be made of HDPE, which has better tensile properties and facilitates expansion and contraction.

[0064] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A stay cable, wherein the first end of the stay cable is connected to the bridge, and the second end of the stay cable is connected to the tower, characterized in that: The invention comprises a cable body, an anchoring device, a protective tube body, a first protective cover, a second protective cover and a dehumidification system, wherein two anchoring devices are provided, and the two anchoring devices are respectively fixed to the two ends of the cable body, and the outer wall of the anchoring device is provided with an anchor pad, and the anchor pad separates the anchoring device into a front end and a rear end, and the protective tube body is sleeved outside the cable body, and the two ends of the protective tube body are respectively connected to the anchor pads on the two anchoring devices, and the front end of the anchoring device is accommodated in the protective tube body, the first protective cover is connected to the rear end of the anchoring device, and the second protective cover is connected to the rear end of the anchoring device. The second protective cover is sealed and connected to the anchor plate, and the first protective cover is accommodated in the second protective cover. The second protective cover is provided with an air cavity and an air vent connected to the air cavity. The air cavity is connected to the interior of the protective tube body. The dehumidification system is used to provide dry gas to the air cavity. The dehumidification system is arranged near the first end or the second end of the inclined cable, and the outlet of the dehumidification system is connected to one of the air vents. During ventilation, the dry gas enters the air cavity from the air vent, flows to the interior of the protective tube body and the other air cavity in sequence, and is then discharged from the other air vent. The anchoring device is provided with a gas passage connecting the air cavity and the interior of the protective tube body. Specifically, the gas passage at the first end of the inclined cable is provided on a washer, and the washer is sleeved on the outer wall surface of the anchoring device near the first end of the inclined cable. The washer is arranged adjacent to the anchor plate located at the first end of the inclined cable, and the washer is accommodated in the second protective cover. The gas passage at the second end of the inclined cable is provided on a nut sleeved on the outer wall surface of the anchoring device near the second end of the inclined cable, and the nut is located between the anchor plate near the second end of the inclined cable and the second protective cover at the second end of the inclined cable.

2. The stay cable according to claim 1, wherein: The dehumidification system includes a dehumidification module and a cable ventilation module connected to the dehumidification module for conveying fresh air processed by the dehumidification module to the cable, wherein the cable ventilation module connects the dehumidification module and the vent hole; The dehumidification module comprises: A filtering device for filtering the input fresh air; a dehumidification device, used for dehumidifying the fresh air filtered by the filtering device, the dehumidification device being connected to the filtering device; a dry air balancing device, used for balancing the air pressure of the fresh air dehumidified by the dehumidification device, the dry air balancing device being connected to the dehumidification device; The gas conveying device is used to convey the fresh air to the filtering device, the dehumidifying device and the dry air balancing device in sequence, and the gas conveying device is connected to the filtering device, the dehumidifying device and the dry air balancing device respectively.

3. The stay cable according to claim 1, wherein: The protective tube body includes a first protective sleeve and a second protective sleeve. The first protective sleeve is arranged near the first end of the inclined cable, and the second protective sleeve is arranged near the second end of the inclined cable. The first protective sleeve is inserted into the interior of the second protective sleeve. A first seal is provided between the first protective sleeve and the second protective sleeve. A first annular groove is provided on the inner wall surface of the second protective sleeve, and the first seal is embedded in the first annular groove.

4. The stay cable according to claim 1, wherein: The protective tube body includes a first protective sleeve and a second protective sleeve. The first protective sleeve is arranged near the first end of the inclined cable, and the second protective sleeve is arranged near the second end of the inclined cable. The first protective sleeve is inserted into the interior of the second protective sleeve. The connection position between the first protective sleeve and the second protective sleeve is wrapped with a laminated canvas or felt. One end of the laminated canvas or felt is sealed to the outer wall of the first protective sleeve by a sealant and is fixed by a first clamp. The other end of the laminated canvas or felt is sealed to the outer wall of the second protective sleeve by a sealant and is fixed by the first clamp.

5. The stay cable according to claim 3 or 4, characterized in that: The protective tube body also includes a first cable guide tube, the first end of which is sleeved on the outer wall surface of the anchoring device near the first end of the inclined cable and fixedly connected to the anchor plate, the second end of the first cable guide tube is inserted into the interior of the first protective sleeve near one end of the first cable guide tube, a second sealing member is provided between the first protective sleeve and the first cable guide tube, a second annular groove is provided on the inner wall surface of the first protective sleeve near one end of the first cable guide tube, and the second sealing member is embedded in the second annular groove.

6. The stay cable according to claim 5, wherein: The protective tube body also includes a tapered flow guide tube arranged between the first cable guide tube and the first protective sleeve, the tapered flow guide tube including a first connecting tube, a second connecting tube and a tapered cylinder connecting the first connecting tube and the second connecting tube, the aperture of the first connecting tube is larger than the aperture of the second connecting tube, the first connecting tube is sleeved on the outer wall surface of the second end of the first cable guide tube, the second sealing member is arranged between the first connecting tube and the second end of the first cable guide tube, the second connecting tube is inserted into the interior of the first protective sleeve near one end of the first cable guide tube, and a third sealing member is provided between the second connecting tube and the first protective sleeve.

7. The stay cable according to claim 6, wherein: A limiting groove is formed on the inner wall surface of one end of the first protective sleeve connected to the second connecting pipe. The second connecting pipe is inserted into the limiting groove and abuts against the bottom wall of the limiting groove.

8. The stay cable according to claim 6, wherein: The third sealing member is an elastic tube body, and the elastic tube body is sleeved at the connection position between the second connecting tube and the first protective sleeve.

9. The stay cable according to claim 3 or 4, characterized in that: The protective tube body further includes a second cable guide tube, a first end of the second cable guide tube is sleeved on the outer wall surface of the anchoring device near the second end of the inclined cable and is fixedly connected to the anchor plate, a second end of the second cable guide tube is sleeved on the outer wall surface of the second protective cover near the second end of the inclined cable, and a fourth sealing member is provided between the second end of the second cable guide tube and the second protective cover; A flange is sealed on the inner wall surface of the second end of the second cable guide tube, the flange is connected to the second protective sleeve, and a fourth sealing member is provided at the connection position between the flange and the second protective sleeve.

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